December 05, 2005
Image of Phenolphthalein

Forensic scientists use phenolphthalein, a chemical indicator, in the Kastle-Meyer presumptive blood test. Phenolphthalein mixed with hydrogen peroxide turns pink when blood is present.

Chemical Abstract Service - a division of ACS

Learn more about this molecule from CAS, the most authoritative and comprehensive source for chemical information.

Molecule of the Week needs your suggestions!

If your favorite molecule is not in our archive, please send us a message. The molecule can be notable for its current or historical importance or for any quirky reason. Thank you!

Stay Ahead of the Chemistry Curve

Learn how ACS can help you stay ahead in the world of chemistry.